Millwall's Under 18s were defeated 4-0 by Middlesbrough in the FA Youth Cup Third Round on Friday afternoon.
At a rain-soaked Heritage Park, goals from Calum Kavanagh (2), Pharrell Willis and Josh Coburn eased Boro into Round Four and ended The Lions' hopes.
Millwall had chances to register on the scoresheet, no more so than when Nana Boateng was fouled inside the box with the score at 1-0, but Oli Bate missed the resulting penalty-kick.
A second spot-kick was granted to The Lions late on, but Boateng - who had been fouled - stepped up and blasted his strike wide.
Millwall: Gilmore, Miller, Smith, Allen, Dailly, Okoli, Leahy, Bate, Briscoe, Abdulmalik, Boateng. Subs: Walker, Hammond, Hamouchene, Hearn, Donaldson.